From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f197.google.com (mail-qk0-f197.google.com [209.85.220.197]) by kanga.kvack.org (Postfix) with ESMTP id 0BC8B6B0271 for ; Mon, 6 Nov 2017 20:47:30 -0500 (EST) Received: by mail-qk0-f197.google.com with SMTP id f199so8641335qke.20 for ; Mon, 06 Nov 2017 17:47:30 -0800 (PST) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id f21si84176qka.383.2017.11.06.17.47.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Nov 2017 17:47:29 -0800 (PST) Subject: Re: [PATCH v2 0/9] memfd: add sealing to hugetlb-backed memory References: <20171106143944.13821-1-marcandre.lureau@redhat.com> From: Mike Kravetz Message-ID: Date: Mon, 6 Nov 2017 17:47:21 -0800 MIME-Version: 1.0 In-Reply-To: <20171106143944.13821-1-marcandre.lureau@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: aarcange@redhat.com, hughd@google.com, nyc@holomorphy.com, David Herrmann On 11/06/2017 06:39 AM, Marc-AndrA(C) Lureau wrote: > Hi, > > Recently, Mike Kravetz added hugetlbfs support to memfd. However, he > didn't add sealing support. One of the reasons to use memfd is to have > shared memory sealing when doing IPC or sharing memory with another > process with some extra safety. qemu uses shared memory & hugetables > with vhost-user (used by dpdk), so it is reasonable to use memfd > now instead for convenience and security reasons. Thanks for doing this. I will create a patch to restructure the code such that memfd_create (and file sealing) is split out and will depend on CONFIG_TMPFS -or- CONFIG_HUGETLBFS. I think this can wait to go in until after this patch series. Unless, someone prefers that it go in first? -- Mike Kravetz > > Thanks! > > v1->v2: after Mike review, > - add "memfd-hugetlb:" prefix in memfd-test > - run fuse test on hugetlb backend memory > - rename function memfd_file_get_seals() -> memfd_file_seals_ptr() > - update commit messages > - added reviewed-by tags > > RFC->v1: > - split rfc patch, after early review feedback > - added patch for memfd-test changes > - fix build with hugetlbfs disabled > - small code and commit messages improvements > > Marc-AndrA(C) Lureau (9): > shmem: unexport shmem_add_seals()/shmem_get_seals() > shmem: rename functions that are memfd-related > hugetlb: expose hugetlbfs_inode_info in header > hugetlbfs: implement memfd sealing > shmem: add sealing support to hugetlb-backed memfd > memfd-tests: test hugetlbfs sealing > memfd-test: add 'memfd-hugetlb:' prefix when testing hugetlbfs > memfd-test: move common code to a shared unit > memfd-test: run fuse test on hugetlb backend memory > > fs/fcntl.c | 2 +- > fs/hugetlbfs/inode.c | 39 +++-- > include/linux/hugetlb.h | 11 ++ > include/linux/shmem_fs.h | 6 +- > mm/shmem.c | 59 ++++--- > tools/testing/selftests/memfd/Makefile | 5 + > tools/testing/selftests/memfd/common.c | 45 ++++++ > tools/testing/selftests/memfd/common.h | 9 ++ > tools/testing/selftests/memfd/fuse_test.c | 36 +++-- > tools/testing/selftests/memfd/memfd_test.c | 212 ++++--------------------- > tools/testing/selftests/memfd/run_fuse_test.sh | 2 +- > tools/testing/selftests/memfd/run_tests.sh | 1 + > 12 files changed, 195 insertions(+), 232 deletions(-) > create mode 100644 tools/testing/selftests/memfd/common.c > create mode 100644 tools/testing/selftests/memfd/common.h > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org